package cn.tedu.sp06.fb;

import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;


/**
 * 本类用于
 *
 * @author SJXQ
 * @version 2022/1/18 14:17
 */
@Component
public class OrderFB implements FallbackProvider {
    /**
     * 设置当前降级类是针对哪个服务进行降级，
     * - item-service:只针对商品降级
     * - *:对所有服务都应用当前降级类
     * - null:同*
     *
     * @return
     */
    @Override
    public String getRoute() {
        return "order-service";
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {

        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                final String json = JsonResult.build().code(HttpStatus.INTERNAL_SERVER_ERROR.value()).msg("调用后台服务出错").toString();
                return new ByteArrayInputStream(json.getBytes());
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders h = new HttpHeaders();
                h.add("Content-Type", "application/json;charset=UTF-8");
                return h;
            }
        };
    }
}
